The secondary electron emission coefficient of materials for helium ion bombardment in the energy range 0.5â€“20 keV was measured for the surface conditions of cathodes in high voltage glow discharges. The materials studied are oxidized aluminum, oxidized magnesium, a molybdenum-aluminum oxide sintered composite, molybdenum, stainless steel, copper, gold, and graphite. Each sample was surface conditioned by operating it as cathode of a helium glow discharge shortly before the electron yield measurement. The results are relevant to the modeling of glow discharges and the design of cold cathode electron guns.

We have investigated the surface coverage and electron emission of thermionic dispenser cathodes during 3 keV Ar[sup +] ion bombardment, thereby simulating the bombardment of the cathodes by residual gases that takes place in cathode-ray tubes as used in television sets. During the ion...

Secondary electron yields depending on work function were measured for 30 species of metal in ultrahigh vacuum by electron and ion bombardment. Secondary electron yields induced by electrons at 10 keV increase with work function, while those by Ar[sup +] ions at 3 keV decrease with increasing...

Reports on the effect of low energy helium[sup+] ion-beam bombardment upon the structure of pyrene thin films formed on quartz substrates. Measurement of film thickness on each sample in a region bombarded by ions and a region shadowed from ions; Effect of ion current density upon pyrene film...

Experimental data show that the minimum divergence of a positive helium ion beam does not occur at the beam perveance predicted by linear ion optics. A model is presented that introduces a third-order term into the ion optics equations, in the manner of a spherical aberration to the plasma...

The effect of helium ion bombardment into semi-insulating (SI) InP at room temperature (RT) and 200Â°C has been investigated with various ion doses in the range of 4 x 10[sub 12] to 1 x 10[sub 16]/cm[sup 2] at 600 keV. The sheet resistivity of SI InP decreases by at least an order of magnitude...

The string mode of operation for an electron beam ion source uses axially oscillating electrons in order to reduce power consumption, also simplifying the construction by omitting the collector with cooling requirements and has been called electron string ion source (ESIS). We have started a...